diff --git a/docs/releases/v0.8.0.md b/docs/releases/v0.8.0.md
new file mode 100644
index 0000000..cb7f0f3
--- /dev/null
+++ b/docs/releases/v0.8.0.md
@@ -0,0 +1,51 @@
+# jpdev v0.8.0
+
+This release makes a check run proportional to a change, adds an opt-in duplication check, and
+turns the kit's own policy vendor-neutral
+([issue #33](https://github.com/Judgment-Pack/judgment-pack-devkit/issues/33),
+[pull request #40](https://github.com/Judgment-Pack/judgment-pack-devkit/pull/40);
+[issue #35](https://github.com/Judgment-Pack/judgment-pack-devkit/issues/35),
+[pull request #41](https://github.com/Judgment-Pack/judgment-pack-devkit/pull/41);
+[issue #42](https://github.com/Judgment-Pack/judgment-pack-devkit/issues/42),
+[pull request #44](https://github.com/Judgment-Pack/judgment-pack-devkit/pull/44);
+[issue #43](https://github.com/Judgment-Pack/judgment-pack-devkit/issues/43),
+[pull request #45](https://github.com/Judgment-Pack/judgment-pack-devkit/pull/45);
+[pull request #39](https://github.com/Judgment-Pack/judgment-pack-devkit/pull/39)).
+
+## Checks proportional to a change
+
+`jpdev check --changed [BASE]` runs only the check-list steps that `jpdev.json` maps the changed
+paths to, taking the paths changed since the merge base of BASE (the default branch when
+omitted) and HEAD, in the working tree, the index and HEAD together. The whole list runs when a
+changed path is unmapped, when `jpdev.json`, the manifest or the runner itself changed, when
+nothing changed, or when the repository has no mapping. A missing merge base (a shallow clone,
+an unknown base) is a refusal, never "nothing changed". The vendored runner
+(`scripts/dev/check.sh --changed`) does the same through a vendored copy of the selection code
+that the kit's tests and the release workflow hold to the library.
+
+On pull requests the CI template now runs `--changed` against the base branch; a push to the
+default branch and a manual dispatch run the whole list, and only those record release evidence.
+`jpdev version` prints the kit checkout's description; an unknown option names it, so a kit
+without a feature says so.
+
+## Duplication check
+
+An opt-in `duplication` step reports copied blocks across a repository's declared languages, with
+per-repository thresholds (`min_tokens`, `min_lines`, `max_file_bytes`), an explicit ignore block
+for copies that are meant to stay, and a size bound with a named refusal when memory runs out.
+Each token run keeps its most recent places and one place that spans `min_lines` lines on its
+own, so a real pair is reported whatever sits between its two copies. Binary files and files
+over the size bound are named and skipped. The kit runs the check on itself.
+
+## Policy
+
+The model that builds or reviews is chosen by use case; a particular vendor's runner is one way
+to run a build, not the default. The policy's "who builds and who reviews" section says what a
+builder, a reviewer and a coordinator each own, independent of the tool that runs them.
+
+## Operating limits
+
+The duplication check covers a copy only where at least one `min_tokens` run spans `min_lines`
+lines on its own; a copy denser than that is covered by the recent-places window alone. Memory
+across many files under `max_file_bytes` is bounded only by the refusal. `jpdev clean` keeps the
+limits of v0.7.0.
diff --git a/lib/common.sh b/lib/common.sh
index 998e1a1..aa80b1f 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -3,7 +3,7 @@
 # Sourced by bin/jpdev and lib/wrap.sh. Needs bash 5.
 
 # shellcheck disable=SC2034  # read by bin/jpdev
-JPDEV_VERSION=0.7.0
+JPDEV_VERSION=0.8.0
 
 # Every setting jpdev reads. The environment wins over the config file, the config file over the default.
 JPDEV_SETTINGS=(JPDEV_SCRATCH JPDEV_LOCK JPDEV_NODE_RSS_MB JPDEV_NODE_TIMEOUT_S JPDEV_GO_ULIMIT_KB
diff --git a/scripts/dev/changed_checks.py b/scripts/dev/changed_checks.py
index 559fc8a..84f7cda 100644
--- a/scripts/dev/changed_checks.py
+++ b/scripts/dev/changed_checks.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# from judgment-pack-devkit v0.7.0 (lib/changed_checks.py)
+# from judgment-pack-devkit v0.8.0 (lib/changed_checks.py)
 """changed_checks.py --root ROOT --manifest MANIFEST [--base BASE] [--label TEXT]
 
 Selects the check-list steps that the changed paths of a clone can affect, for
diff --git a/scripts/dev/check.sh b/scripts/dev/check.sh
index 8250cdb..39e3645 100755
--- a/scripts/dev/check.sh
+++ b/scripts/dev/check.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# from judgment-pack-devkit v0.7.0 (templates/check.sh)
+# from judgment-pack-devkit v0.8.0 (templates/check.sh)
 # scripts/dev/check.sh [--setup] [--only a,b | --changed [BASE]] [--skip a,b] [--all] [--manifest FILE]
 # Runs the checks of dev.json in order and prints one summary block; exit status = failures.
 # --changed runs only the checks jpdev.json maps the paths changed since the merge base of BASE
diff --git a/scripts/dev/handover_check.sh b/scripts/dev/handover_check.sh
index d204b7a..5d84bcb 100755
--- a/scripts/dev/handover_check.sh
+++ b/scripts/dev/handover_check.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# from judgment-pack-devkit v0.7.0 (lib/handover_check.sh)
+# from judgment-pack-devkit v0.8.0 (lib/handover_check.sh)
 set -eu
 
 python3 - <<'PY'
diff --git a/templates/check.sh b/templates/check.sh
index 8250cdb..39e3645 100755
--- a/templates/check.sh
+++ b/templates/check.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# from judgment-pack-devkit v0.7.0 (templates/check.sh)
+# from judgment-pack-devkit v0.8.0 (templates/check.sh)
 # scripts/dev/check.sh [--setup] [--only a,b | --changed [BASE]] [--skip a,b] [--all] [--manifest FILE]
 # Runs the checks of dev.json in order and prints one summary block; exit status = failures.
 # --changed runs only the checks jpdev.json maps the paths changed since the merge base of BASE